...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Fuel >The effects of using structurally less-stable raw materials for the support of a spray-dried oxygen carrier with high NiO content
【24h】

The effects of using structurally less-stable raw materials for the support of a spray-dried oxygen carrier with high NiO content

机译：使用结构上不太稳定的原材料来支撑高NiO含量的喷雾干燥氧气载体的效果

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

An oxygen carrier for chemical looping combustion (CLC) requires high mechanical strength, high reactivity, and other physical properties suitable for fluidized-bed processes. Spray-dried NiO oxygen carriers prepared using structurally stable raw materials such as α-Al_2O_3and MgAl_2O_4 as support have required a calcination temperature above 1400℃ to obtain sufficient mechanical strength applicable to fluidized-bed process, and their oxygen transfer capacity has been less than 10 wt%. Here, we present a spray-dried oxygen carrier prepared using high NiO content (70wt%) and structurally less-stable raw materials (20 wt% γ-Al_2O_3, 5 wt% pseudoboehmite, and 5 wt% bentonite), which resulted in reducing a calcination temperature and enhancing the performances of the oxygen carrier. The prepared oxygen carrier showed excellent physical properties, especially high mechanical strength and spherical shape, suitable for fluidized-bed applications and high reactivity. The calcination temperature to obtain sufficient mechanical strength was lowered to 1100℃. At the reaction temperature of 950℃, the oxygen transfer capacities determined by a thermogravimetric analyzer were 13.9 and 12.4 wt% for the oxygen carriers calcined at 1100 and 1250℃, respectively, indicating more than 82% of the total oxygen in the raw NiO was transferred to the fuel. The excellent physical properties were still maintained after ten cyclic redox tests in a bubbling fluidized-bed reactor. On the other hand, the oxygen carrier prepared with α-Al_2O_3 had sufficient mechanical strength when calcined at 1400℃, and showed much lower performance in reactivity and physical properties. This work confirms that the use of high NiO content and structurally less-stable raw support materials composed of γ-Al_2O_3 mixed with a small amount of pseudoboehmite and bentonite can reduce the calcination temperature to obtain sufficient mechanical strength and improve the performance of a spray-dried NiO oxygen carrier for the CLC of gaseous fuels.
机译：用于化学回路燃烧（CLC）的氧气载体需要高机械强度，高反应活性和其他适用于流化床工艺的物理性能。使用结构稳定的原材料（例如α-Al_2O_3和MgAl_2O_4）作为载体制备的喷雾干燥NiO氧载体要求煅烧温度高于1400℃，才能获得适用于流化床工艺的足够机械强度，并且其氧转移能力小于10重量％。在这里，我们介绍了使用高NiO含量（70wt％）和结构上较不稳定的原材料（20 wt％γ-Al_2O_3、5 wt％假勃姆石和5 wt％膨润土）制备的喷雾干燥的氧气载体。煅烧温度和提高氧载体的性能。所制得的氧载体显示出优异的物理性能，特别是高机械强度和球形，适用于流化床应用和高反应性。为了获得足够的机械强度，将煅烧温度降低到1100℃。在950℃的反应温度下，用热重分析仪测定的在1100和1250℃下煅烧的氧载体的氧转移容量分别为13.9和12.4 wt％，表明原始NiO中总氧的82％以上为转移到燃料。在鼓泡的流化床反应器中进行十次循环氧化还原测试后，仍保持优异的物理性能。另一方面，用α-Al_2O_3制备的氧载体在1400℃煅烧时具有足够的机械强度，而在反应性和物理性能上却低得多。这项工作证实，使用高含量的NiO和结构较不稳定的由γ-Al_2O_3与少量假勃姆石和膨润土混合组成的原料载体可以降低煅烧温度，以获得足够的机械强度并改善喷雾性能。用于气态燃料CLC的干燥NiO氧气载体。

著录项

  • 来源
    《Fuel》 |2012年第2012期|p.106-114|共9页
  • 作者

    Jeom-In Baek; Chong Kul Ryu; Ji Hyun Lee; Tae Hyoung Eom; Joong Beom Lee; Ho-Jung Ryu; Jungho Ryu; Jongheop Yi;

  • 作者单位

    KEPCO Research Institute, 65 Munji-ro, Yuseong, Daejeon 305-380, Republic of Korea;

    KEPCO Research Institute, 65 Munji-ro, Yuseong, Daejeon 305-380, Republic of Korea;

    KEPCO Research Institute, 65 Munji-ro, Yuseong, Daejeon 305-380, Republic of Korea;

    KEPCO Research Institute, 65 Munji-ro, Yuseong, Daejeon 305-380, Republic of Korea;

    KEPCO Research Institute, 65 Munji-ro, Yuseong, Daejeon 305-380, Republic of Korea;

    Korea Institute of Energy Research, 102 Gajeong-ro, Yuseong-gu, Daejeon 305-343, Republic of Korea;

    Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources, Daejeon 305-350, Republic of Korea;

    School of Chemical and Biological Engineering, Institute of Chemical Process, Seoul National University, San 56-1, Shillim, Kwanak, Seoul 151-742, Republic of Korea;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    chemical-looping combustion; oxygen carrier; nickel oxide; spray-drying method;

    机译：化学循环燃烧;氧气载体氧化镍喷雾干燥法;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号